21845834 has 8 divisors (see below), whose sum is σ = 33217860. Its totient is φ = 10773216.

The previous prime is 21845827. The next prime is 21845843. The reversal of 21845834 is 43854812.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 2512225 = 4397^2 + 1585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21845794 and 21845803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74669 + ... + 74960.

Almost surely, 2^21845834 is an apocalyptic number.

21845834 is a deficient number, since it is larger than the sum of its proper divisors (11372026).

21845834 is a wasteful number, since it uses less digits than its factorization.

21845834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149704.

The product of its digits is 30720, while the sum is 35.

The square root of 21845834 is about 4673.9527169196. The cubic root of 21845834 is about 279.5478843078.

The spelling of 21845834 in words is "twenty-one million, eight hundred forty-five thousand, eight hundred thirty-four".